C. Koidl

Publications (2)1.93 Total impact

• Source

  Available from: ac.at

  Conference Proceeding: Targeted attacks on quantization-based watermarking schemes

  P. Meerwald, C. Koidl, A. Uhl
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  ABSTRACT: While many watermarking methods show good robustness against common signal processing operations, security of the watermarking schemes under intentional attack exploiting knowledge of the implementation has been widely neglected. In this paper, we demonstrate straightforward, targeted attacks for a number of quantization based watermarking methods and provide implementations. The attacks require only one watermarked image and retain the fidelity of the image. The watermarking methods discussed are therefore not suitable for copyright protection applications.
  Image and Signal Processing and Analysis, 2009. ISPA 2009. Proceedings of 6th International Symposium on; 10/2009
• Source

  Available from: psu.edu

  Article: Attack on “Watermarking Method Based on Significant Difference of Wavelet Coefficient Quantization”

  P. Meerwald, C. Koidl, A. Uhl
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  ABSTRACT: This letter describes an attack on the recently proposed ldquowatermarking method based on significant difference of wavelet coefficient quantizationrdquo by Lin While the method is shown to be robust against many signal processing operations, security of the watermarking scheme under intentional attack exploiting knowledge of the implementation has been neglected. We demonstrate a straightforward attack which retains the fidelity of the image. The method is therefore not suitable for copyright protection applications. Further, we propose a countermeasure which mitigates the shortcoming.
  IEEE Transactions on Multimedia 09/2009; · 1.93 Impact Factor